Really, for a 30 year old tractor they're still keeping track? I know for older vehicles there are manuals all over the place since the companies don't really support them or make parts anymore. Do they even sell them?
Anyway back to the tractor. I was looking at the handle in question and it looks like there's a spot for a wire or something to be attached to it and a spot for it to run towards the front of the tractor with a pulley right over the engine. I do not, however, see the wire/cord/whatever. Does that need to be attached in order for the tractor to start and could that be causing the no-start situation or would it exclusively be the switch?